Product Revenue by Geographic Location and Percentage of Total Product Revenue (Detail) (USD $)
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3 Months Ended | 12 Months Ended | |||||||||
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2011
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Sep. 30, 2011
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Jun. 30, 2011
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Mar. 31, 2011
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Revenues from External Customers and Long-Lived Assets [Line Items] | |||||||||||
Revenue | $ 22,606,465 | $ 14,766,611 | $ 19,624,769 | $ 14,360,660 | $ 18,444,287 | $ 18,455,817 | $ 16,140,852 | $ 11,737,679 | $ 71,358,505 | $ 64,778,635 | $ 55,556,594 |
Percentage of revenue | 100.00% | 100.00% | 100.00% | ||||||||
United States
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Revenues from External Customers and Long-Lived Assets [Line Items] | |||||||||||
Revenue | 57,904,290 | 48,366,140 | 38,313,594 | ||||||||
Percentage of revenue | 81.10% | 74.70% | 69.00% | ||||||||
Europe
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Revenues from External Customers and Long-Lived Assets [Line Items] | |||||||||||
Revenue | 6,267,830 | 10,988,664 | 12,976,985 | ||||||||
Percentage of revenue | 8.80% | 16.90% | 23.30% | ||||||||
Other
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Revenues from External Customers and Long-Lived Assets [Line Items] | |||||||||||
Revenue | $ 7,186,385 | $ 5,423,831 | $ 4,266,015 | ||||||||
Percentage of revenue | 10.10% | 8.40% | 7.70% |